Diddle daddle is a phrase which means to waste time or engage in trivial activities. The antonyms for diddle daddle are terms that suggest productivity, efficiency, and seriousness. Some examples of antonyms for diddle daddle are: focus, concentrate, work, concentrate, apply oneself, accomplish, achieve, finish, and complete. These antonyms describe actions that should be taken seriously, with a sense of urgency and purpose. When people avoid diddle daddle in their work, they are able to achieve more in less time, and they are often more satisfied with their accomplishments. Thus, avoiding diddle daddle is essential for success in any endeavor.